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If 0 le x le 2pi , then the number of r...

If ` 0 le x le 2pi` , then the number of real value of x , which satisfy the equation ` cos x + cos 2x + cos 3x + cos 4x=0` , is

A

9

B

3

C

5

D

7

Text Solution

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The correct Answer is:
D
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